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85 lines
2.5 KiB
85 lines
2.5 KiB
/* |
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* DVD subtitle decoding for ffmpeg |
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* Copyright (c) 2005 Fabrice Bellard |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "libavutil/intreadwrite.h" |
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#include "avcodec.h" |
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/* parser definition */ |
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typedef struct DVDSubParseContext { |
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uint8_t *packet; |
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int packet_len; |
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int packet_index; |
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} DVDSubParseContext; |
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static av_cold int dvdsub_parse_init(AVCodecParserContext *s) |
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{ |
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return 0; |
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} |
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static int dvdsub_parse(AVCodecParserContext *s, |
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AVCodecContext *avctx, |
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const uint8_t **poutbuf, int *poutbuf_size, |
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const uint8_t *buf, int buf_size) |
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{ |
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DVDSubParseContext *pc = s->priv_data; |
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if (pc->packet_index == 0) { |
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if (buf_size < 2) |
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return 0; |
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pc->packet_len = AV_RB16(buf); |
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if (pc->packet_len == 0) /* HD-DVD subpicture packet */ |
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pc->packet_len = AV_RB32(buf+2); |
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av_freep(&pc->packet); |
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pc->packet = av_malloc(pc->packet_len); |
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} |
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if (pc->packet) { |
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if (pc->packet_index + buf_size <= pc->packet_len) { |
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memcpy(pc->packet + pc->packet_index, buf, buf_size); |
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pc->packet_index += buf_size; |
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if (pc->packet_index >= pc->packet_len) { |
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*poutbuf = pc->packet; |
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*poutbuf_size = pc->packet_len; |
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pc->packet_index = 0; |
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return buf_size; |
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} |
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} else { |
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/* erroneous size */ |
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pc->packet_index = 0; |
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} |
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} |
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*poutbuf = NULL; |
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*poutbuf_size = 0; |
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return buf_size; |
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} |
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static av_cold void dvdsub_parse_close(AVCodecParserContext *s) |
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{ |
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DVDSubParseContext *pc = s->priv_data; |
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av_freep(&pc->packet); |
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} |
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AVCodecParser dvdsub_parser = { |
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{ CODEC_ID_DVD_SUBTITLE }, |
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sizeof(DVDSubParseContext), |
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dvdsub_parse_init, |
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dvdsub_parse, |
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dvdsub_parse_close, |
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};
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